Most played cards in B/R Aggro:

1 Decks
Goblin Guide
4 copies - 4 average
Goblin Outlander
4 copies - 4 average
Lavaclaw Reaches
4 copies - 4 average
Lightning Bolt
4 copies - 4 average
Graven Cairns
4 copies - 4 average
Figure of Destiny
4 copies - 4 average
Anathemancer
4 copies - 4 average
Auntie's Hovel
4 copies - 4 average
Blightning
4 copies - 4 average
Boggart Ram-Gang
4 copies - 4 average
Volcanic Fallout
3 copies - 3 average
Deathmark
3 copies - 3 average
Everlasting Torment
3 copies - 3 average
Kargan Dragonlord
3 copies - 3 average
Dragonskull Summit
3 copies - 3 average
Flame Javelin
3 copies - 3 average
Magma Spray
2 copies - 2 average
Infest
2 copies - 2 average
Guttural Response
2 copies - 2 average
Sarkhan the Mad
2 copies - 2 average